john gurdob and shinya yamanaka said mature cells can be turned into new tissue. the nobel committee said they revolutionized the understanding of how cells develop. scientists are now using their research to treat diseases, including par kin sons and diabetes. >>> big celebrations today in venezuela following the re-election of hugo chavez. the controversial leader is set to rule that oil-rich country for another six years. but as nbc's carey sanders reports, opposition by his own people is stronger than ever. >> reporter: fireworks filled the skies. as the street fight continued well into the early morning hours. a chavez victory say supporters means his brand of socialism is here to stay. >> we're living socially. >> reporter: hugo chavez, 58 years old, a star among the poor in south america, was himself surrounded by a hollywood star sunday, actor danny glover. a chavez supporter. for almost 14 years, the revolution has captured the imagination of the core here, in large part because he's taken this nation's oil wealth and used its profits to give away free ho